ipAddress
The IPv4 or IPv6 IP address for the endpoint that you want Amazon Route 53 to perform health checks on. If you don't specify a value for IPAddress, Route 53 sends a DNS request to resolve the domain name that you specify in FullyQualifiedDomainName at the interval that you specify in RequestInterval. Using an IP address that is returned by DNS, Route 53 then checks the health of the endpoint.
Use one of the following formats for the value of IPAddress:
IPv4 address: four values between 0 and 255, separated by periods (.), for example,
192.0.2.44.IPv6 address: eight groups of four hexadecimal values, separated by colons (:), for example,
2001:0db8:85a3:0000:0000:abcd:0001:2345. You can also shorten IPv6 addresses as described in RFC 5952, for example,2001:db8:85a3::abcd:1:2345.
If the endpoint is an EC2 instance, we recommend that you create an Elastic IP address, associate it with your EC2 instance, and specify the Elastic IP address for IPAddress. This ensures that the IP address of your instance never changes. For more information, see the applicable documentation:
Linux: Elastic IP Addresses (EIP) in the Amazon EC2 User Guide for Linux Instances
Windows: Elastic IP Addresses (EIP) in the Amazon EC2 User Guide for Windows Instances
If a health check already has a value for IPAddress, you can change the value. However, you can't update an existing health check to add or remove the value of IPAddress.
For more information, see FullyQualifiedDomainName.
Constraints: Route 53 can't check the health of endpoints for which the IP address is in local, private, non-routable, or multicast ranges. For more information about IP addresses for which you can't create health checks, see the following documents: